Show the script of a task in help dialog

[agilgur5]

Some tasks are self-explanatory if you looked at their script and need no description. I also think knowing what script the task actually runs can be helpful context if only reading from the help dialog and not the maidfile itself.

For instance, I have a clean task that just runs rm -rf build/. If the help dialog outputted this, I wouldn't need to add a description, but since it doesn't I have to add the redundant description of "Cleans the build/ folder".
Tasks without a description also say "No description" instead of not showing anything (potentially a separate issue/PR to address)

nps's help dialog does output the actual script of the task. When no description is given, it will only show the script (never says "No description").